A method for simultaneously machining the center bore of a gear workpiece and the end faces perpendicular to the axis of the center bore

ABSTRACT

A multi-surface machining method for simultaneously machining the center bore of a gear workpiece concentric to the pitch circle of the gear teeth, and machining one or both of the end faces of the gear workpiece perpendicular to the axis of the center bore. The gear workpiece is rotated in a centerless manner by a pair of master gears comprising a driving gear and a braked retainer gear. The master gears improve the surface finish characteristics of the tooth flanks of the gear teeth while rotating the gear workpiece. Simultaneously, a first machining means is reciprocated axially in the gear workpiece center bore, and a second machining means is reciprocated over one or both of the end faces of the gear workpiece in a direction perpendicular to the axis of the center bore.

United States Patent Ellis et al.

A METHOD FOR SIMULTANEOUSLY MACHINING THE CENTER BORE OF A GEAR WORKPIECE AND THE END FACES PERPENDICULAR TO THE AXIS OF THE CENTER BORE 1 Oct. 24, 1972 Elta miner- Donald 0. Kelly Attorney-James H. Bower [57] ABSTRACT A multi-surface machining method for simultaneously machining the center bore of a gear workpiece con- [72] Inventors: Myron Royal oak; centric to the pitch circle of the gear teeth, and Cmbak P Keith machining one or both of the end faces of the gear nonaldumon Lakeianof workpiece perpendicular to the axis of the center [73] Assignee; Micmmaflc Hone Corporation, bore. The gear workpiece is rotated in a centerless Detroit Mich manner by a pair of master gears comprising a driving gear and a braked retainer gear. The master gears im- Filed! g- 19, 1970 prove the surface finish characteristics of the tooth [21] AppL NOJ 65,160 flanks of the gear teeth while rotating the gear workpiece. Simultaneously, a first machining means lS Related s. Application m reciprocated axially in the gear workpiece center bore, and a second machining means is reciprocated [62] Dwlslo of 701,447 1968 over one or both of the end faces of the gear work- Pat. No. 3,525,178. piece in a direction perpendicular to the axis of the center bore.

[52] US. Cl. ..51/287 r r [51] Int. Cl. ..B24b 1/00 [58] Field of Search ..51/28l R, 281 P, 287, 290,

[56] References Cited UNITED STATES PATENTS 2 Claims, 35 Drawing Figures 2,924,910 2/1960 Klomp ..51/2s7 x 3,524,283 8/1970 .lones ..5l/l05 R X JZJ J54 J68 7497773 6/6- 56/ F574 ,F oo 2,, 00 f7; 3;: 3g '1 oo .5, 00 FT 1 o o [r 226 2a: 21;; //4L| an; 532 j: 29o

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1. The method of generating a final surface finish on the tooth flanks of the gear teeth on a gear workpiece having a center bore and simultaneously generating center bore to pitch circle concentricity and end face to center bore squareness, comprising, the simultaneous operations of: a. rotating the gear workpiece in a centerless manner about an axis coaxial with the center of the center bore, between a pair of machining gears to machine the tooth flanks of the gear teeth on the gear workpiece; b. machining at least one of the end faces of the gear workpiece perpendicular to said axis; and, c. machining the center bore of the gear workpiece concentric to said axis.
 2. The method of simultaneously generating center bore to characteristic circle concentricity and end face to center bore squareness on a rotatable workpiece having a center bore, a pair of end faces perpendicular to said center bore, and a characteristic circle, comprising, the simultaneous operations of: a. rotating the rotatable workpiece in a centerless manner about an axis coaxial with the center of the center bore, between a rotating drive member and a braked member engaging the rotatable workpiece at said characteristic circle; b. machining at least one of the end faces of the rotatable workpiece perpendicular to said axis; and, c. machining the center bore of the rotatable workpiece concentric to said characteristic circle. 